Acceptance of low-sugar yoghurt among Latvian teenagers
Laen...
Kuupäev
2020
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Abstrakt
Over a thousand year history, yoghurt has become one of a widely consumed
product in the world. Its reputation as a healthy food has been undermined recently by concerns
over the high sugar content. The majority of consumers expects and prefers yoghurts to be sweet.
However, governments across Europe are calling for significant cuts in the amount of added sugar
used in yoghurt production. The aim of the study was to evaluate the acceptance of low-sugar
yoghurt produced by different commercial β-galactosidases by teenagers. Standardised milk with
fat content 2.0% (SC Tukuma piens) was pasteurized at 95 ± 1 °C 5 min, cooled down till
43 ± 1 °C and fermented with β-galactosidase and starter YC-X11 (Chr. Hansen, Denmark) and
fermented till pH 4.50 ± 0.20. Different commercial β-galactosidases: Nola™ Fit 5500,
Ha-Lactase 5200 (Chr. Hansen, Denmark), GODO-YNL2 (Danisco, Denmark) and BrennZyme
(Brenntag PolskaSp, Poland) were used. Fermented samples were gently mixed and cooled down
till 6 ± 1 °C and 5% (w/w) of sugar was added to each sample. Sensory evaluation of the yoghurt’s
samples was performed by teenagers (14–18 years, n = 50) at Aizputes Secondary School
(Latvia). Lactose and monosaccharides concentration prior to sugar addition was detected by
HPLC (Shimadzu LC 20 Prominence, Japan).
The lactose hydrolysis into glucose and galactose by the use of β-galactosidase helps to increase
sweetness through an occurrence of natural sugars in milk. During sensory evaluation, teenagers
admitted the yoghurt with reduced sugar as sweet, significantly sweeter (P < 0.05) was yoghurt
sample with Nola™ Fit 5500. The results demonstrated that it is possible to reduce sugar in
yoghurt production and to gain consumer acceptance through the occurrence of glucose and
galactose, but it is problematic to offer lactose-free or reduced lactose products to consumers
without lactose intolerance.
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acceptance, sweetness, yoghurt, β-galactosidase, articles